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Limit the amount of transactions to FIFO size

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This commit is contained in:
Florian Zaruba 2017-07-31 16:33:26 +02:00
parent ce17852cec
commit 6b80701844
1 changed files with 12 additions and 12 deletions
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24
src/if_stage.sv
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@ -59,10 +59,11 @@ module if_stage (
// Control signals
address_fifo_t push_data, pop_data;
logic fifo_valid, fifo_ready;
logic pop_empty, empty; // pop the address queue in case of a flush, empty signal
logic pop_empty; // pop the address queue in case of a flush, empty signal
logic empty, full;
// we are busy if we are either waiting for a grant or if the FIFO is full
assign if_busy_o = (CS == WAIT_GNT) || !fifo_ready || (CS == WAIT_ABORTED_REQUEST);
assign if_busy_o = (CS == WAIT_GNT) || !fifo_ready || (CS == WAIT_ABORTED_REQUEST) || full;
assign fetch_address = {fetch_address_i[63:2], 2'b0};
// --------------------------------------------------
@ -182,17 +183,16 @@ module if_stage (
// ---------------------------------
fifo #(
.dtype ( address_fifo_t ),
// we can only have two in-flight instructions:
.DEPTH ( 2 )
.dtype ( address_fifo_t ),
.DEPTH ( 2 ) // right now we support two outstanding transactions
) i_fifo (
.flush_i ( 1'b0 ), // do not flush, we need to keep track of all outstanding rvalids
.full_o ( ), // This queue should not underflow...
.empty_o ( empty ), // .. or overflow
.single_element_o ( ), // isn't needed here
.data_i ( push_data ),
.push_i ( instr_gnt_i ), // if we got a grant push the address and data
.data_o ( pop_data ),
.flush_i ( 1'b0 ), // do not flush, we need to keep track of all outstanding rvalids
.full_o ( full ), // the address buffer is full
.empty_o ( empty ), // .. or overflow
.single_element_o ( ), // isn't needed here
.data_i ( push_data ),
.push_i ( instr_gnt_i ), // if we got a grant push the address and data
.data_o ( pop_data ),
.pop_i ( fifo_valid || pop_empty ), // pop the data if we say that the fetch is valid
.*
);